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
The CommonCreateWindow code requires having a BrowserHost for the tab that's creating the window, which it tries to get from the requestor's BrowserParent. For remote BrowserParents, though, there is no BrowserHost, so we need to get it from the top-level embedder instead. Differential Revision: https://phabricator.services.mozilla.com/D45172 --HG-- extra : moz-landing-system : lando